* {
    padding: 0;
    margin : 0;
}

html {
    font-size: 100px;
}

@media screen and (max-width: 750px) {
    html {
        font-size: 13.3333vw;
    }
}

body {
    width : 7.5rem;
    margin: auto;
}

.content {
    position        : relative;
    background-color: rgba(43, 46, 46, 0.9);
    width           : 7.5rem;
    height          : 16.3rem;
}

.content-snow {
    position: absolute;
    filter  : drop-shadow(0 0 10px white);

}

.snow {
    position     : absolute;
    width        : .1rem;
    height       : .1rem;
    left         : .2rem;
    background   : rgba(255, 255, 255, 1);
    border-radius: 50%;
}

.content-introduce {
    filter   : drop-shadow(0 0 10px white);
    position : absolute;
    top      : 30%;
    left     : 50%;
    transform: translate(-50%, -50%);
    width    : 5rem;
}

.introduce {
    display       : flex;
    flex-direction: column;
    align-items   : center;
}

h1 {
    font-size: .5rem;
    color    : #fff;
}

h2 {
    font-size: .3rem;
    color    : #fff;
}

a {
    cursor     : pointer;
    font-size  : .3rem;
    font-weight: 800;
    color      : #c988df;
}

.content-introduce img {
    width         : 0.3rem;
    height        : 0.3rem;
    border-radius : 30%;
    vertical-align: middle;
}

p {
    display: inline;
}

.content-background {
    position: fixed;
    width   : 7.5rem;
    height  : 3.8rem;
    bottom  : 0;
}

.first {
    position       : absolute;
    bottom         : 0;
    width          : 7.5rem;
    height         : 1.9rem;
    background     : url('https://s1.ax1x.com/2022/03/31/qW6dhT.png') no-repeat;
    background-size: 300%;
    animation      : first-bg 45s linear infinite;
    z-index        : 1;
}

.second {
    position       : absolute;
    bottom         : 0;
    width          : 7.5rem;
    height         : 3.6rem;
    background     : url('https://s1.ax1x.com/2022/03/31/qW6Dc4.png') no-repeat;
    background-size: 300%;
    animation      : second-bg 20s linear infinite;
}

.bear {
    width: 7.5rem;
}

footer {
    position  : absolute;
    bottom    : 0;
    width     : 2rem;
    height    : 1rem;
    background: url('https://s1.ax1x.com/2022/03/31/qW6yu9.png') no-repeat;
    animation : bearMove 1s steps(8) infinite, Move 5s linear forwards;
    z-index   : 1;
}

@keyframes bearMove {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: -16rem 0;
    }
}

@keyframes Move {
    0% {
        left: 0%;
    }

    100% {
        left             : 50%;
        -webkit-transform: translateX(-50%);
    }
}

@keyframes first-bg {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: -10rem 0;
    }

}

@keyframes second-bg {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: -12rem 0;
    }
}